Mil'janza shares the Healing Ward and Stasis Trap abilities with other witch doctors, though he lacks the Sentry Ward ability and instead has access to Sleep.
Unlike other witch doctors in the campaign mission, Mil'janza had magic damage, while the others had piercing damage.
Speculation
This article or section includes speculation, observations or opinions possibly supported by lore or by Blizzard officials. It should not be taken as representing official lore.
It's possible that he was originally going to be appear By Demons Be Driven in order to give a side quest to free his imprisoned fellow Darkspear from the cages within the Warsong bases.